<template>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model="name" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model="age" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="sex">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click="add">添加/修改</button>
    </div>
    <div>
      <table border="1" cellpadding="10" cellspacing="0">
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item, index) in arr" :key="item.index">
          <td>{{ index + 1 }}</td>
          <td>{{ item.name }}</td>
          <td>{{ item.age }}</td>
          <td>{{ item.sex }}</td>
          <td>
            <button @click="del(item.id)">删除</button>
            <button @click="edit(index)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
</template>

<script>
export default {
  name: "App",
  data() {
    return {
      arr: JSON.parse(localStorage.getItem("mylist1")) || [],
      num: "",
      name: "",
      age: "",
      sex: "",
      flag: true,
      index:0 // 保存正在编辑的对象的索引，注意这里的初始值不能为0及0以上的数
    };
  },
  methods: {
    add() {
      if (this.flag) {
        this.arr.push({
          name: this.name,
          age: this.age,
          sex: this.sex,
          id: +new Date(),
        });
      }else{
        this.arr[this.index].name=this.name
        this.arr[this.index].age=this.age
        this.arr[this.index].sex=this.sex
      }
    },
    del(id) {
      this.arr = this.arr.filter((item) => item.id !== id);
    },
    edit(index) {
      this.name = this.arr[index].name;
      this.age = this.arr[index].age;
      this.sex = this.arr[index].sex;
      this.flag=false
    },
  },
  watch: {
    arr(val) {
      localStorage.setItem("mylist1", JSON.stringify(val));
    },
    deep: true,
  },
};
</script>

<style>
</style>